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Table 1 Hydraulic components used in the coupling and damping mechanisms

From: Improving stand-to-sit maneuver for individuals with spinal cord injury

 

Hip and knee cylinders

Valves

Proportional valve

Knee accumulator

Manufacturer

Clippard Minimatic

Hydraforce

Parker Hannifin

Parker Hannifin

Clippard Minimatic

Type

double acting

4-way, 2-pos normally closed

2-way manual needle valve

2-way, normally closed

spring return single-acting

Bore

7/8″

3/4″

Port

1/8″ NPT

SAE 6

1/8″ NPT

SAE 4, 1/4" NPTF

1/8″ NPT

Stroke

3″

1″

Rod diameter

0.25″

0.25″

Voltage

12 VDC

12 VDC

Max operating pressure

2000 psi

3000 psi

6000 psi

3000 psi

250 psi

Spring force

3 lbs installed 6lbs compressed